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4. Foggy background
Cause
Step
Cleaning failure
1
Optical failure
2
PC Drum failure
3
4
Developing failure
5
6
Main Erase Lamp
7
failure
8
AIDC Sensor fail-
9
ure
10
Check Item
Is the Cleaning Blade dirty with
foreign matter, paper dust, etc.
or is it scratched?
Is the mirror or lens dirty?
Is the PC Drum dirty with for-
eign matter, etc.?
Is the PC Drum properly
grounded?
Is the Sleeve Roller abnor-
mally dirty?
Is the developing bias contact
normal?
Does the Main Erase Lamp
light up properly?
Is the Main Erase Lamp dirty?
Is the AIDC Sensor clean or
installed properly?
Is the AIDC halftone pattern
dirty?
T-89
Result
Action
Change the Cleaning Blade.
YES
YES Clean the mirror or lens.
Clean or replace the PC Drum.
YES
Replace the Cleaning Blade if
necessary.
Clean or replace the PC Drum
NO
Ground Plate.
Clean the Sleeve Roller.
Check the Developer Scatter-
YES
ing Prevention Seal to see if it
is deformed or dirty.
Clean or replace the develop-
NO
ing bias contact.
Replace the Main Erase Lamp.
NO
YES Clean the Main Erase Lamp.
Clean or reinstall the AIDC
NO
Sensor and execute F5.
Using care not to scratch, wipe
YES
the pattern with a dry soft cloth
and execute F5.
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Troubleshooting
